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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Cash flows from operating activities:    
Net income $ 1,552 $ 1,918
Adjustments to reconcile net income to net cash used in operating activities:    
Depreciation and amortization of property, plant and equipment and intangible assets 5,441 5,539
Amortization of other long-term assets 189 714
Provision for bad debts 700 581
Stock-based compensation 2,005 1,474
Change in deferred income taxes (1,025) 122
Changes in liabilities for uncertain tax positions or unrecognized tax benefits 35 371
Change in equity investment fair value (638) 22
Other (5) 72
Foreign currency transaction gains (373) (446)
Changes in assets and liabilities associated with operations:    
Increase in net receivables (5,579) (8,779)
Increase in inventories (9,353) (33,731)
Increase (decrease) in prepaid expenses and other assets (1,466) 600
Change in income tax receivable/payable, net 1,014 (2,965)
(Decrease) increase in accounts payable (3,951) 5,655
Decrease in customer prepayments (37,037) (22,759)
Increase in accrued program costs 6,399 10,660
Decrease in other payables and accrued expenses (332) (500)
Net cash used in operating activities (42,424) (41,452)
Cash flows from investing activities:    
Capital expenditures (3,565) (2,590)
Proceeds from disposal of property, plant and equipment 23 0
Acquisition of a product line 0 (703)
Intangible assets (25) (15)
Net cash used in investing activities (3,567) (3,308)
Cash flows from financing activities:    
Payments under line of credit agreement (35,346) (27,300)
Borrowings under line of credit agreement 83,463 72,000
Net receipt from the issuance of common stock under ESPP 430 480
Net (payment) receipt from the exercise of stock options 0 18
Net payment from common stock purchased for tax withholding (14) (13)
Repurchase of common stock 0 (557)
Payment of cash dividends (834) (851)
Net cash provided by financing activities 47,699 43,777
Net (decrease) increase in cash and cash equivalents 1,708 (983)
Effect of exchange rate changes on cash and cash equivalents 585 223
Cash and cash equivalents at beginning of period 11,416 20,328
Cash and cash equivalents at end of period $ 13,709 $ 19,568